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/*-
* Copyright (c) 2005 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <machine/prom.h>
#include <machine/rpb.h>
static unsigned long lastpcc;
static int tnsec;
/*
* Count the number of elapsed seconds since this function was called first.
* The algorithm uses the processor's cycle counter, which means that it'd
* better be called frequently (on a 433Mhz machine this means at least once
* every 9 seconds or so).
*/
int
getsecs()
{
struct rpb *hwrpb = (struct rpb *)HWRPB_ADDR;
unsigned long curpcc;
int delta;
if (tnsec == 0) {
tnsec = 1;
lastpcc = alpha_rpcc() & 0xfffffffful;
return (tnsec);
}
curpcc = alpha_rpcc() & 0xfffffffful;
if (curpcc < lastpcc)
curpcc += 0x100000000ul;
delta = (curpcc - lastpcc) / hwrpb->rpb_cc_freq;
if (delta) {
tnsec += delta;
lastpcc = curpcc & 0xfffffffful;
}
return (tnsec);
}
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